872100521 has 2 divisors, whose sum is σ = 872100522. Its totient is φ = 872100520.

The previous prime is 872100517. The next prime is 872100533. The reversal of 872100521 is 125001278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548496400 + 323604121 = 23420^2 + 17989^2 .

It is a cyclic number.

It is not a de Polignac number, because 872100521 - 2² = 872100517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (872100571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436050260 + 436050261.

It is an arithmetic number, because the mean of its divisors is an integer number (436050261).

Almost surely, 2^872100521 is an apocalyptic number.

It is an amenable number.

872100521 is a deficient number, since it is larger than the sum of its proper divisors (1).

872100521 is an equidigital number, since it uses as much as digits as its factorization.

872100521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 872100521 is about 29531.3481067153. The cubic root of 872100521 is about 955.4079453745.

Adding to 872100521 its reverse (125001278), we get a palindrome (997101799).

The spelling of 872100521 in words is "eight hundred seventy-two million, one hundred thousand, five hundred twenty-one".